Abstract
In most of the previous theories dealing with shape thermal fluctuations of quasi spherical vesicles, the membrane was considered as a homogeneous shell characterized by its bending moduli. Our description considers the fluctuations to be followed by a lateral redistribution of the molecules within the bilayer and by an intermonolayer friction. These phenomena change the expressions for both the mean square values and the dynamic behavior of the fluctuation mode amplitudes. The corrections are expressed through the bending moduli of blocked and free exchange of the molecules within the monolayers. Numerical estimations show that such effects can be observed when shape fluctuations of giant quasi spherical vesicles are analyzed.
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